To address the challenging nature and slow tunneling
of hard rock tunnel boring machines in the hard rock stratum, a tunnel boring
machine equipped with a water jet cutterassisted rock breaking system
is developed. This system enables rock breaking through the integrated action
of a water jet and a disc cutter. Certain aspects of water jet cutterassisted rock breaking technology have been already studied: (1) The
carrying and design concept of water jet cutterassisted
rock braking system is introduced, and the working principles and parameters of
the jet system pump station, transport system, and jet system are presented.
(2) An experimental test is conducted to obtain the relationship between the
index parameters of rock breaking and highpressure jet
parameters. (3) The water jet cutterassisted rock
breaking technology is equipped and applied in the field. Further, the test
measures and data, tunneling effect, environmental temperature, system power,
and existing problems are obtained using realtime data
collection, and corresponding measures are proposed. (4) The approaches for
optimizing and improving the water jet cutterassisted
rock breaking technology are proposed based on the field tests. The results
show that the water jet cutterassisted rock breaking
technology is feasible. The field and torque penetration indices under 270 MPa
water pressurecoupled tunneling are reduced by 38.1%
and 16.9%, respectively, demonstrating good rock breaking effect. Moreover,
temperature increase in the tunnel and abnormal wear of highpressure water pipelines should be addressed in the future as they
affect the normal tunneling of equipment.
QI Zhichong
,
LYU Dan
,
HE Fei
,
XU Guangyi
. Carrying and Application of Water Jet CutterAssisted
Rock Breaking Technology[J]. Tunnel Construction, 2023
, 43(8)
: 1404
-1412
.
DOI: 10.3973/j.issn.2096-4498.2023.08.015
